The Holtek HT7039A-2 with Microprocessor & Microcontroller Supervisors SOT-89 (SOT-89-3) RoHS is a microscopic integrated circuit (IC) that provides supervisory functions to maintain proper system operation. Its features include an adjustable precision reset threshold, watch-dog timer, low supply current, a wide supply voltage range, capability to detect brown-out conditions, and an open drain or CMOS reset output. It is available in an industry-standard SOT-89-3 package that is RoHS compliant. By using these features, the HT7039A-2 can protect essential digital systems from latch-up and malfunction by resetting them during unstable conditions and to prevent equipment shut-downs due to over voltage/under voltage or over temperature events.